Suba Khalil sells a line of copy mactines that feature a "quick change" toner cartridge. The empty toner cartridge can be teplaced quickly, without any mess, in a matter of seconds. Which of the following statements represents the most effective preseatation of this fcature?

a$."$We have recently developed the only office copy machine that features a quick change tonet cartridge."

b$.$ "After years of research and developmeat, our engineers developed a quick change toner cartridge."

a$.$ Tf you purchase one of our copy machines, you will eajoy the benefits of a quick change tonet carridge:

d$.$ "Ail of our copy machines ate equipped with a quick change toner eartridge, which means you no longer waste time replacing an empty toner cartridge."

c$."$We have ret a new industry standard with the quick change toner cartridge."